Tool-holder.



PATENTBD SEPT. ze, 1905.

M. BARBER. f TOOL HOLDER. ArPLIcATIoN Hmm Dnc. 2a. 190s.'

H/ ...WMI/f z UNITED f sTATEs PATENT OEEIOE.

MELviN BARBER, OE OKLAHOMA, OKLAHOMA TERRITORY.

' TOOL-HOLDER.

Applicationkled Decemlier 28, 1903. Serial No. 186,860.

To all whom, t may concern,.-

Be it known that I, MELviN BARBER, ay citizen-of the United States, residing at Oklahoma, in the county of Oklahoma and Terri-v tory of Oklahoma, have invented a new and useful Tool-Holder, of which the following is A further object of the invention is to obtain the positive actuation of the jaws in both directions, thus eliminating the necessity of springs either for the actuation or retention of any element which maybe coperatively related to the jaws.

A still further object is to provide novel means for holding the elements in their coacting relation, said means also constituting a brake or friction device for `preventing a too free movement of the shell.

The preferred embodiment of the invention is illustrated in the-accompanying drawings', though various chan es may be made from the construction set orth without departing from the spirit of theV invention. Y i

In said drawings, Figure 1 is a side elevation of the improved holder. Fig. 2 is a longitudinal sectional view through the same. Fig. 3 is a view similar to Fig. 2, the section being taken in a plane at right angles to that of said figure. Fig.v 4 is 'a longitudinal sectional view of the shell or sleeve detached.v

Fig. 5 is a detail pers ective view of the head and jaws removed om the shell or sleeve. Fig. 6 is a cross-section taken on the line 6 6 of Fig. 2, but showing the pivots in elevation. Fig. 7- is a cross-sectional view taken on the line 7 7 of Fig. 2. Fig. 8 is an end elevation of the sleeve. Fig.v 9 is an end view of the complete holder.

Similarl reference-numerals indicate Acorre sponding parts in all the figures of the drawings.

Inl the embodiment illustrated a lsuitable shaft or spindle 10 is employed, which may constitute a part of a brace or other actuator, said spindle havin@r an enlarged head 11 at one end, which is bifurcated by the provision Specification of Letters Bat/ent.

. portions k19 andthe Patented sept. 26, 1905.`

of a longitudinally-disposed slot 12, extending from the free end of the head to a point contiguous its opposite end. This slot preferably has its intermediate portion enlarged7 asshown at 13. The slot constitutes a seat for apair of clampingor gripping jaws 14, having pivots 15 located between their ends and detachably fitted in notches or sockets 16, located on opposite sides ofthe slot 12.

The ends of the jaws are enlarged, as shown at 17 and 18,-so that they will` roject beyond-v the side faces of, the head. T e ends 1S are .provided with outstandingl lugs 1.9, and the corresponding end of the head 1,1 also has peripheral outstanding flanges 20, the portions 19 of the jaws fitting between and correspondling in shape to said flanges. The adjacent or o osing innerfaces of the jaws are preferaln) y angular in cross-section, as shown at 21,

vand are designed to receive and firmly engage the squared stem 22 of a tool-shank 23. The

portions 17 of the jawsin rear of the pivots 15 may be termed tailpiecesff From the above construction it will be seen that when the tailpieces are forced within the plane ofthe periphery 'of the head the jaws .proper will move outwardly beyond the periphery of the head, and vice versa. It therefore follows that if. positive means are provided for alternately urging the tailpieces and tli'ejaws proper toward the aXis of the shank lpositive actuation of the jaws will be secured in` both directions, the depression or inward movement. of the .tailpieces servin to separate'the gripping-faces 21 and s' ar movement of the jaw portions 18 serving, of

course, to bring said faces into clamping contact' with the shank ofthe bit or other tool to be held. For the purpose of accomplishing these movements a rotary sleeve or shell 24 IOOl cam-ribs 25 and 26, one pair ofwhich is op.-l i posed to the jaw portions proper, 18, while-.

the others, 26, coact with the tailpieces 17. Obviously the jaw portionsand tailpieces must be arranged foralternate actuation,and provision must befmade for permitting one,

end to move in a direction oppositeto the direction vin which the other is urged under lthe impulse of the rib. Said ribs are therefore disposed in alternating arrangement-that is to say, the ribs 25 are disposed in diametric- IIO ally-opposed relation, and the ribs 26, while being relatively disposed in a similar manner, are located in planes intermediate of the ribs 25. In other words, they are disposed at the opposite ends of a diameter bearing a rightangular relation to that upon which the ribs 25 are formed. The eliect of this disposition of the cams will prevent them from obstructing the functions of each other-that is to say, when the ribs 26 are moving over the tailpieces and forcing the same toward each 'other the ribs 25, coacting with the jaws proper, will be moving away from said jaw enlargements 18 to permit the operative ends of the jaws to open without interference. ln this manner the jaws will not only be positively moved to their clamping and releasing positions, but are retained with certainty in any intermediate position, as it will be evident that no matter what relation they may assume their movement in either direction is absolutely dependent upon the rotary movement of the shell. The particular relation of the several cam-ribs is possessed of still further utility. For instance, they serve as stops for limiting the movement of the sleeve or shell in either direction. This will be made plain by reference to Figs. 6 and 7 of the drawings, wherein it will be seen that rotary movement of the shell in one direction-to wit, that direction in which the jaws will be eXpanded-will cause the enlargements 1S to abut against the rear ends of the ribs 25 to limit the movement of the shell in one direction, while in like manner the tailpieces will limit the movement of the shell in the opposite direction by abutting against the rear ends of the ribs 26 when the jaws are at the limit of their inward movement.

As already stated, the shell or sleeve 24 abuts against the flanges 2() and outstanding portions 19, being thusheld against displacement in one direction. It is held against movement in the opposite direction by a holding-nut 27, threaded on a reduced rear portion 28 of the head and having its inner end fitted within the shell. This nut is provided with an annular flange 29, which abuts against the rear end of the sleeve or shell. The nut is held against rotation by a suitable set-screw 30, threaded through the same and bearing against the head. rl`his nut, besides holding the actuating sleeve or shell in place, constitutes a friction-brake to prevent the too free movement of the same and also to take up all looseness or wear.

The manner of manipulating the holder is as follows: When the sleeve is rotated in one direction, the cams bearing against the tailpieces will force the operative ends of the jaws apart to permit the introduction of the tool to be held. After such introduction the sleeve is revolved in an opposite direction, thus throwing the cams 25 into operation against the enlargements 1S, consequently forcing the jaws into engagement with the tool. Another reversal will of course release the tool. For the reasons already given said tool will be held lirmly by the structure, and in order that no :ufeidental movement may take place on the part olA thel sleeve the holding-nut may be screwed into as tight engagement with the same as desired. The holder, moreover, can be manufactured at small cost, as the elements are simple and can be easily assembled. rl`here are no intricate parts liable to derangement or damage and no springs employed in connection with the holding-jaws.

From the foregoing it is thought that the construction, operation, and many advantages of the herein-described invention will be apparent to those skilled in the art without further description, and it will be understood that various changes in the size, shape, proportion, and minor details olI construction mayjbe resorted to without departing from the spirit or sacrificing any ol' the advantages of the invention.

Having thus described my invention, what I claim as new, and desire to secure by lietters Patent, is

l. A tool-holder, including a head, a pivotally-mounted jaw carried by the head, and a rotary jaw-actuating member mounted on the head and retained against longitudinal movement thereon, said member engaging the jaw on opposite sides of its pivot for swinging the same in opposite directions.

2. A tool-holder, including a. head, a pivotally-mounted jaw carried thereby, and a rotary jaw-actuating member mounted on the head and retained against longitudinal movement thereon, said member having inwardly-extending ams that engage the j aw on opposite sides of its pivot l'or swinging said jaw in opposite directions.

3, A tool-holder comprising a head, a plurality of pivotally-mounted jaws carried thereby, a rotary j aw-actuating member retained against relative longitudinal movement with respect to the head, and means engaging the jaws at opposite sides ol` their pivots for actuating the jaws through the rotary movement of said member.

4. ln a tool-holder, the combination with a head and a plurality of pivotally-mounted jaws, of a relatively rotary ja\\'actuating member provided with oppositely-disposed offset cams projecting laterally from the actuating member and arranged for engagement with the aws at opposite sides of the pivots thereof.

5. ln a tool-holder, the combination with a head and a pivotally-mounted jaw, of a relatively rotary jaw-actuating member provided with o'll`set oppositcly-disposed cams projecting laterally from the actuating mem- IOO 'j rality of pivotal jaws carried thereby and j pivots for actuating sai provided with tailpieces, and a rotar jawactuating member having opposite y-disposed cams opposite to the jaws and-tailpieces respectively, said cams being arranged out of Valinement respecting the longitudinal direction of the holder whereby the rotary movement in opposite directions of the jaw-actuating member serves to positively operate the jaws and is limited by the contact of either of the jaws or tailpieces with the rear ends of the cams. l 8. A tool-holder comprising a head provided with a plurality of pivoted jaws, Aand a rotary jaw-actuating member, havin'gmeans engaging the jaws at op osite sides of their j jaws through the rotary movement of the jaw-actuating member, said means also constituting a stop for limiting the relative'movement of said member in both directions.

9. A tool-holder comprising a head, a plurality of pivoted jaws provlded with tailpieces, a sleeve surrounding the head and having internal -transversely-disposed cam-4 shaped' ribs arran ed to respectively engage the jaws and taIlpieces, said ribs having their faces inclined in opposite directionsand the ribs coactingwith the tailpieces and jaws being disposed in alternate arrangement to eiect the positive actuation ofthe jaws in opposite directions and'limiting the movement of the `sleeve by the abutting of the rear ends of one set of ribs against the tail' pieces, or by the abutting of the other set of ribs against the jaws proper.

10. A tool-holder comprising .a head, a

plurality of pivotally-mounted jaws carried thereby, a jaw-actuatingv member mounted on the head and engaging the jaws at o pposite sides of their pivots 4to cause said jaws to approach or recede as the jaw-actuating member is rotated in o posite directions, means for reventing the ongitudinalv movement of t e member with respect to the head, and means yfor limiting the rotary movement of said member in opposite directions. i

11. In a tool-holder, the combination with a head, 'of a' jaw movably mounted on the head, a rotatable actuating member for moving the jaw, said member having frictional engagement'at one end with-the head, and

means adjustably mounted on the head and member for holding said actuating member in such frictional engagement.

,12. In a tool-holder, the combination with a head, of a jaw movably mounted on the head,I a rotatable actuating member for movengaging the other end of the actuating ed on the head, a sleeve rotatably mounted on the head and engaging the jaws to move the same, and a nut screwed on the head and bearing against one end of the sleeve.4

l 14. In-a tool-holder, the combination with ahead having an outstanding flange at one end, a plurality of jaws pivotally 'mounted on the head, a sleeve revolubly mounted on the head and having one end bearing against the flange thereof, said sleeve engaging the jaws to move the same, and a nut threaded on the head and bearing against the opposite end of the sleeve.

In testimony that I claim the foregoing as.

my own I have hereto affixed my signature in the presence of two Witnesses.

v MELVIN BARBER.

Witnesses: A

J. W. HENDERSON, HENRY BIcE. 

